Hmmm well I have a cheapo 350w PS and I have it hooked up to 2 Maxtor HD's, one DVD-RW drive, radeon 9800 Pro, cathode lights, a bunch of fans. Haven't had a problem.
Since it sounds like you've decided on the 9800 Pro you could just buy it, hook it up and see if there is still enough juice in your system. If you have stability issues, take out the 9800, put the MX back in temporarily, then buy a new PS. 250w might be able to cut it depending on how many devices you have, but eventually sometime down the line you will have to get a more powerful PS.
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"A casual stroll through the lunatic asylum shows us that faith proves nothing." - Friedrich Nietzsche
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